MBC install help.

808Guy · 07-12-2004, 09:05 PM

I'm installng the MBC in place of the N75. After searching the archives all I found was diagrams, but no pics of an actual MBC installed. From what I understand the MBC plugs right place using the wastegate and boost hoses that go to the N75. The ambient hose remains plugged into the N75. From my pic can someone confirm that it's installed correctly? Also when adjusting the MBC do you guys start with the screw all the way out and work your way down or start it at some point like 1/2 way?

TIA

Mike2kS4 · 07-12-2004, 10:55 PM

When I adjusted it I blew into the MBC and screwed it down until I had some resistance. That should be safe.

Watch your boost gauge very carefully. The first few turns you're gonna say "wtf?" and think it's not working, but it will start making big changes in pressure quickly so be careful. 1/4 turn can make a readable difference in pressure.

PsychoS4 · 07-12-2004, 11:14 PM

FatFreeVW · 07-12-2004, 11:16 PM

JBear::FATS · 07-12-2004, 11:16 PM

them in parallel you must SPLIT the boost and vacuum hoses.

808Guy · 07-13-2004, 12:29 AM

could it be a bad spring in the MBC? couldn't really blow anything out of it. also do I need to put in the TCD now or can I do some runs to set the boost to proper levels first?

808Guy · 07-13-2004, 12:30 AM

we just removed the pressure hoses and transfered them to the MBC.

lemieux@curbside · 07-13-2004, 06:08 AM

check my pic poster..

Audi2ptzero · 07-13-2004, 06:36 AM

you want to loop a hose betwen the 2 open ends of the N75.

DAP@EPL · 07-13-2004, 06:58 AM

He asked about the N75 by itself.

As Audi2ptzero suggested, loop a peice of hose between the open ends of the N75.

As for adjusting, back it all the way out and slowly tighten and test until you reach the desired boost pressure.

-Dave Pramanik

07-12-2004, 09:05 PM	#1
808Guy AudiWorld Super User Garage is empty, add now Join Date: Mar 2000 Posts: 3,260	MBC install help. I'm installng the MBC in place of the N75. After searching the archives all I found was diagrams, but no pics of an actual MBC installed. From what I understand the MBC plugs right place using the wastegate and boost hoses that go to the N75. The ambient hose remains plugged into the N75. From my pic can someone confirm that it's installed correctly? Also when adjusting the MBC do you guys start with the screw all the way out and work your way down or start it at some point like 1/2 way? TIA __________________

07-12-2004, 10:55 PM	#2
Mike2kS4 AudiWorld Super User Garage is empty, add now Join Date: Jun 2002 Posts: 12,096	Looks good. When I adjusted it I blew into the MBC and screwed it down until I had some resistance. That should be safe. Watch your boost gauge very carefully. The first few turns you're gonna say "wtf?" and think it's not working, but it will start making big changes in pressure quickly so be careful. 1/4 turn can make a readable difference in pressure. __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

07-12-2004, 11:14 PM	#3
PsychoS4 Junior Member Garage is empty, add now Join Date: Feb 2002 Posts: 588	Are you running your MBC by itself or with N75 too? __________________ X Chip / ASP DP’s / Borla / H&R CO's / Neuspeed 19mm / Toy Guy SS / AWE DTS / APR Snub / More...

07-12-2004, 11:16 PM	#4
FatFreeVW AudiWorld Member Garage is empty, add now Join Date: May 2000 Posts: 319	you will get a CEL without the N75 hooked up, how do people do it the right way? __________________ 97 VW Gti 12v turbo VR6 Dynoed 409whp on 100 octane gas 98 VW Gti 24v VR6 3.1 liter syncro 2000 Nogaro Blue S4 w/ FULL stage 3 from AWE-TUNING installed by ME

07-12-2004, 11:16 PM	#5
JBear::FATS Senior Member Garage is empty, add now Join Date: Sep 2000 Posts: 4,424	By looking at his picture, he is running by itself. To run them in parallel you must SPLIT the boost and vacuum hoses. __________________ ________________________________________ 2001 S4 6-Speed Santorin Engine/Drivetrain: ASP Custom Tuned Stage III Fueling, RS4 Y-Pipe/Clutch/Fuel Pump/IC's, X1 Intake, Samco F-Hose, APR Bi-Pipe, Piggie Pipes, Miltek Single, AWE DTS, APR Snub, TG SS, VAST Water/Meth Kit. Suspension/Brakes: Vogtland GT, Neuspeed Rear Swaybar (Med), Stoptech 332 BBK. Exterior: 18" BBS CH, M3 Lip Spoiler, SPP Foglight Bulbs, RS4 Grill, E-Codes. Interior: UUC Alcantata Boot, TwinData EFU, Strat S4 Logo Floor Mats, HW V1, PhatBox.

07-13-2004, 12:29 AM	#6
808Guy AudiWorld Super User Garage is empty, add now Join Date: Mar 2000 Posts: 3,260	hmm...I had the screw all the way out and had resistance... could it be a bad spring in the MBC? couldn't really blow anything out of it. also do I need to put in the TCD now or can I do some runs to set the boost to proper levels first? __________________

07-13-2004, 12:30 AM	#7
808Guy AudiWorld Super User Garage is empty, add now Join Date: Mar 2000 Posts: 3,260	the N75 is still electronically plugged in. we just removed the pressure hoses and transfered them to the MBC. __________________

07-13-2004, 06:08 AM	#8
lemieux@curbside AudiWorld Super User Garage is empty, add now Join Date: Dec 2002 Posts: 17,781	another pic here.i hope it helps.. check my pic poster.. __________________ ************************************************ ************************************* "it's a B5 S4 ,it may break down, but its far enough ahead, by the time its fixed, you still haven't caught up." -best line i've heard AUDI B5 S4 detail info (pdf file) that everyone should read and have saved on his computer AUDI B5 RS4 study guide detail info (pdf file) FATS database VAG-COM LOCATOR ASP Hands down the "BESTEST" tuner out there.

07-13-2004, 06:36 AM	#9
Audi2ptzero Elder Member Garage is empty, add now Join Date: Sep 2002 Posts: 14,369	If your going to leave the N75 in like that you want to loop a hose betwen the 2 open ends of the N75.

07-13-2004, 06:58 AM	#10
DAP@EPL Audiworld Sponsor Garage is empty, add now Join Date: Jun 2000 Posts: 19,700	That's in parallel with the N75. He asked about the N75 by itself. As Audi2ptzero suggested, loop a peice of hose between the open ends of the N75. As for adjusting, back it all the way out and slowly tighten and test until you reach the desired boost pressure. -Dave Pramanik __________________

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